The ADM13305 is a dual voltage supervisor designed to monitor two supplies and provide a reset signal to DSP and microprocessor-based systems. There are five models available， all of which feature a combination of internally pretrimmed undervoltage threshold options for monitoring 1.8 V， 2.5 V， 3.3 V， and 5 V supplies. There is also an adjustable input option with an undervoltage threshold voltage of 0.6 V. The ADM13305-18， ADM13305-25， and ADM13305-33 models have two internally fixed thresholds. The ADM13305-4 and ADM13305-5 offer one internally fixed threshold and one externally programmable threshold via a resistor string. See the Ordering Guide for a list of all available options. During power-up， RESET is asserted when the supply voltage exceeds 1.1 V. The device then monitors the SENSEv input pins and holds the RESET output low as long as either of the SENSEv inputs remains below the rising threshold voltage， VIT+.